Which type of logic is most commonly associated with PLC input signals?

The type of logic most commonly associated with PLC (Programmable Logic Controller) input signals is digital logic. In the context of PLCs, input signals are generally in binary form, representing two discrete states: ON (1) or OFF (0). This binary nature aligns with the principles of digital logic, where signals are classified based on two distinct levels corresponding to these states.

Digital logic is fundamental to PLC operation because it allows for straightforward interpretation of input signals from various sensors and switches. These inputs could come from devices like limit switches, push buttons, or proximity sensors, which do not provide a continuous range of values but rather indicate specific conditions, such as whether a machine part is in position or a safety guard is engaged.

While Boolean logic is indeed related to the representation of conditions in a binary system (where variables can be true or false), it is more of a theoretical framework used for designing logical expressions and circuits. In practical terms, the input signals themselves in a PLC environment are primarily digital, as they are categorized distinctly into high (1) and low (0) states.

Taking this into account, digital logic is the most accurate description of the type of logic associated with PLC input signals, while options like analog and continuous pertain to